<template>
  <div>
     <!-- 别忘了打空格 -->
    <div v-for="(item, index) in arr " style="display: inline-block" :key="index">
      <input type="checkbox" v-model="Numbs" :value="item" />
      <span>{{ item }}</span>
    </div>
    <p>你选中的元素, 累加的值和为: {{ AllNum }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      Numbs: []
    }
  },
  computed: {
    AllNum() {
      return this.Numbs.reduce((sum, val) => {
        // console.log(this.Numbs)
        // console.log(val)
        return (sum += val)
      }, 0)
    }
  }
}
</script>

<style>
</style>